US PATENT SUBCLASS 396 / 441
.~.~ Pneumatic or magnetic

Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

439  DF  CAMERA DETAIL {15}
440  DF  .~ Film restraining means or pressure plate {2}
441.~.~ Pneumatic or magnetic

DEFINITION

Classification: 396/441

Pneumatic or magnetic:

(under subclass 440) Subject matter in which a force to press or hold the film is generated by a pressure differential created by a gas medium or by a magnet.